Ingeniería Mecánica
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Item Optimización - MSR del material compuesto de matriz epoxi reforzado con fibra natural chambira (Astrocaryum) y sintética (Kevlar) mediante infusión de resina al vacío y su incidencia en las propiedades mecánicas(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2023-02) Moreno Robalino, Jonathan Patricio; Paredes Salinas, Juan GilbertoIn the following work we will focus on the elaboration and characterization of the search for new hybrid and low weight sandwich materials, using different configurations in the reinforcement stacking. In order to achieve a reduction in weight and facilitate the elaboration, an epoxy resin reinforced with chambira fiber woven with kevlar fiber was used, taking into account the number of layers and positions to be worked, using the vacuum resin infusion method and its impact on the mechanical properties, for the specimens a curing at different temperatures and laser cutting with CO2 was performed. The Box-Behnken design method based on response surfaces was used, which allows the input of three continuous factors with their levels respectively, which are detailed as follows: Fiber Orientation 1 and Orientation 2 between 45, 0 and -45 degrees and curing temperature with 60, 90 and 120 degrees Celsius. At the time of the design, the number of treatments to be carried out was specified and in the mechanical tests of each sample, an analysis of the data was made and organized and validated in order to have their mechanical properties. The tests performed on the specimens yielded several results which helped to determine the most optimal configuration of the layers.Item Análisis de las características mecánicas de un material compuesto de matriz polimérica reforzado con partículas de caucho de neumáticos reciclados y su incidencia en las propiedades mecánicas.(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2019) Acosta Benavides, Carolina Nataly; Espín Lagos, Segundo ManuelThe addition of recycled tires rubber particles in thermostable polymers is a shape to promote the recycling of scrap tires, replacing traditional materials with environment friendly composite material, for this reason, the present project had as objectives to obtain the composite of recycled tires rubber particles and polyester resin with reinforcement concentrations of 30%, 35% and 40% for three different sizes of particles, manufacture test pieces standard and characterize the composite through Flexural, Compressive and Hardness tests under the standards ASTM D7264-07, ASTM D695-15, ASTM D785-03 and ASTD 2240-05 respectively and Fractography. This allowed to obtain experimentally the mechanical properties of the composite, obtaining as a result that the combination of 30% rubber particles of G1 particle size and 70% polyester resin presented the best mechanical properties with: the máximum flexural stress of 13,16 MPa, flexural modulus of elasticity of 425,46 MPa, maximum strain of 3,21%, maximum compressive stress of 7,49 MPa, yield stress of 1,94 MPa, compressive modulus of elasticity of 37,40 MPa, compressive strain of 20,29%, and 17,01 Rockwell hardness. Also, it was determined that the incorporation of rubber particles in the polyester resin had a negative impact on the máximum flexural and compressive stress, flexural and compressive modulus of elasticity, and hardness, but it bear higher flexural and compressive strain. The composite material is adequate for the manufacture of headlights edge of a Hino AK bus with a mínimum thickness of 3 mm, because it complies with a minimum safety factor of 2,931, ensuring the suitable performance of the piece in aerodynamic conditions.